sWe
Your guides are... fantastic, superb, marvellous, knowledgeable....

I think I've found them all now. My TilersForums.co.uk lever arch is bulging and now has its own sWe Guides section. I'm a huge advocate of technical knowledge, the more I know, the better it must surely make me (imo).
In summary is it correct that contract emulsion for new plaster will suffice but any other substrate should be washed first with say sugar soap or at least tacked down and then correctly sealed?
The builder I work for told me last year that professional tilers do not prime their walls prior to tiling, including new plaster. I couldn't argue with that as I had no idea what professional tilers do, I just knew I had been taught to do it and that was that! He was upset because he told the customer I wouldn't be priming and when I did he thought it made him look an idiot!